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annotate dmd/TemplateValueParameter.d @ 40:caa9bdb08ae6

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TemplateValueParameter.matchArg implemented
author korDen
date Sat, 21 Aug 2010 07:10:53 +0400
parents d4825905adc2
children ea4769860460
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1 module dmd.TemplateValueParameter;
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2
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3 import dmd.TemplateParameter;
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4 import dmd.Scope;
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5 import dmd.Declaration;
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6 import dmd.ArrayTypes;
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7 import dmd.Type;
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8 import dmd.Expression;
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9 import dmd.Loc;
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10 import dmd.Identifier;
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11 import dmd.OutBuffer;
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12 import dmd.HdrGenState;
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13 import dmd.MATCH;
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14 import dmd.VarDeclaration;
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15 import dmd.Initializer;
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16 import dmd.ExpInitializer;
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17 import dmd.STC;
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18 import dmd.Util;
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19 import dmd.TY;
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20 import dmd.WANT;
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21 import dmd.TOK;
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22
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23 import dmd.Dsymbol : isExpression;
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24
0
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25 class TemplateValueParameter : TemplateParameter
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26 {
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27 /* Syntax:
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28 * valType ident : specValue = defaultValue
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29 */
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30
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31 Type valType;
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32 Expression specValue;
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33 Expression defaultValue;
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34
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35 static Expression edummy;
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36
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37 this(Loc loc, Identifier ident, Type valType, Expression specValue, Expression defaultValue)
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38 {
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39 super(loc, ident);
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41 this.valType = valType;
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42 this.specValue = specValue;
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43 this.defaultValue = defaultValue;
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44 }
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45
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46 TemplateValueParameter isTemplateValueParameter()
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47 {
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48 return this;
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49 }
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50
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51 TemplateParameter syntaxCopy()
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52 {
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53 TemplateValueParameter tp = new TemplateValueParameter(loc, ident, valType, specValue, defaultValue);
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54 tp.valType = valType.syntaxCopy();
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55 if (specValue)
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56 tp.specValue = specValue.syntaxCopy();
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57 if (defaultValue)
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58 tp.defaultValue = defaultValue.syntaxCopy();
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59 return tp;
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60 }
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61
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62 void declareParameter(Scope sc)
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63 {
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64 VarDeclaration v = new VarDeclaration(loc, valType, ident, null);
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65 v.storage_class = STC.STCtemplateparameter;
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66 if (!sc.insert(v))
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67 error(loc, "parameter '%s' multiply defined", ident.toChars());
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68 sparam = v;
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69 }
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70
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71 void semantic(Scope sc)
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72 {
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73 sparam.semantic(sc);
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74 valType = valType.semantic(loc, sc);
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75 if (!(valType.isintegral() || valType.isfloating() || valType.isString()) && valType.ty != TY.Tident)
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76 error(loc, "arithmetic/string type expected for value-parameter, not %s", valType.toChars());
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77
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78 if (specValue)
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79 {
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80 Expression e = specValue;
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81
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82 e = e.semantic(sc);
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83 e = e.implicitCastTo(sc, valType);
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84 e = e.optimize(WANTvalue | WANTinterpret);
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85 if (e.op == TOKint64 || e.op == TOKfloat64 ||
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86 e.op == TOKcomplex80 || e.op == TOKnull || e.op == TOKstring)
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87 specValue = e;
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88 //e.toInteger();
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89 }
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90
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91 static if (false) { // defer semantic analysis to arg match
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92 if (defaultValue)
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93 {
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94 Expression e = defaultValue;
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95
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96 e = e.semantic(sc);
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97 e = e.implicitCastTo(sc, valType);
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98 e = e.optimize(WANTvalue | WANTinterpret);
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99 if (e.op == TOKint64)
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100 defaultValue = e;
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101 //e.toInteger();
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102 }
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103 }
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104 }
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105
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106 void print(Object oarg, Object oded)
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107 {
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108 assert(false);
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109 }
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110
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111 void toCBuffer(OutBuffer buf, HdrGenState* hgs)
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112 {
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113 assert(false);
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114 }
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115
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116 Object specialization()
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117 {
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118 return specValue;
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119 }
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120
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121 Object defaultArg(Loc loc, Scope sc)
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122 {
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123 assert(false);
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124 }
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125
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126 bool overloadMatch(TemplateParameter tp)
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127 {
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128 TemplateValueParameter tvp = tp.isTemplateValueParameter();
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129
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130 if (tvp)
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131 {
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132 if (valType != tvp.valType)
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133 return false;
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134
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135 if (valType && !valType.equals(tvp.valType))
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136 return false;
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137
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138 if (specValue != tvp.specValue)
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139 return false;
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140
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141 return true; // match
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142 }
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143
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144 return false;
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145 }
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146
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147 MATCH matchArg(Scope sc, Objects tiargs, int i, TemplateParameters parameters, Objects dedtypes, Declaration* psparam, int flags)
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148 {
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149 //printf("TemplateValueParameter.matchArg()\n");
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150
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151 Initializer init;
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152 Declaration sparam;
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153 MATCH m = MATCHexact;
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154 Expression ei;
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155 Object oarg;
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156
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157 if (i < tiargs.dim)
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158 oarg = cast(Object)tiargs.data[i];
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159 else
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160 {
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161 // Get default argument instead
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162 oarg = defaultArg(loc, sc);
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163 if (!oarg)
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164 {
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165 assert(i < dedtypes.dim);
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166 // It might have already been deduced
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167 oarg = cast(Object)dedtypes.data[i];
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168 if (!oarg)
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169 goto Lnomatch;
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170 }
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171 }
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172
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173 ei = isExpression(oarg);
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174 Type vt;
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175
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176 if (!ei && oarg)
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177 goto Lnomatch;
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178
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179 if (ei && ei.op == TOKvar)
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180 {
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181 // Resolve const variables that we had skipped earlier
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182 ei = ei.optimize(WANTvalue | WANTinterpret);
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183 }
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184
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185 if (specValue)
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186 {
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187 if (!ei || ei == edummy)
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188 goto Lnomatch;
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189
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190 Expression e = specValue;
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191
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192 e = e.semantic(sc);
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193 e = e.implicitCastTo(sc, valType);
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194 e = e.optimize(WANTvalue | WANTinterpret);
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195 //e.type = e.type.toHeadMutable();
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196
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197 ei = ei.syntaxCopy();
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198 ei = ei.semantic(sc);
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199 ei = ei.optimize(WANTvalue | WANTinterpret);
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200 //ei.type = ei.type.toHeadMutable();
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201 //printf("\tei: %s, %s\n", ei.toChars(), ei.type.toChars());
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202 //printf("\te : %s, %s\n", e.toChars(), e.type.toChars());
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203 if (!ei.equals(e))
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204 goto Lnomatch;
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205 }
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206 else if (dedtypes.data[i])
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207 { // Must match already deduced value
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208 Expression e = cast(Expression)dedtypes.data[i];
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209
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210 if (!ei || !ei.equals(e))
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211 goto Lnomatch;
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212 }
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213 Lmatch:
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214 //printf("\tvalType: %s, ty = %d\n", valType.toChars(), valType.ty);
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215 vt = valType.semantic(Loc(0), sc);
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216 //printf("ei: %s, ei.type: %s\n", ei.toChars(), ei.type.toChars());
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217 //printf("vt = %s\n", vt.toChars());
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218 if (ei.type)
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219 {
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220 m = cast(MATCH)ei.implicitConvTo(vt);
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221 //printf("m: %d\n", m);
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222 if (!m)
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223 goto Lnomatch;
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224 }
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225 dedtypes.data[i] = cast(void*)ei;
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226
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227 init = new ExpInitializer(loc, ei);
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228 sparam = new VarDeclaration(loc, vt, ident, init);
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229 sparam.storage_class = STCmanifest;
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230 *psparam = sparam;
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231 return m;
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232
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233 Lnomatch:
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234 //printf("\tno match\n");
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235 *psparam = null;
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236 return MATCHnomatch;
0
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237 }
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238
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239 void* dummyArg()
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240 {
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241 assert(false);
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242 }
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243 }